Are there performance differences or style preferences in case vs function heads?

Chat & Discussions Discussions
, ,
1

@adkron brought up an interesting point today; Case and cond statements could be better represented as multiple function heads.
for example:

  case :foo do
     {:ok, :bar} -> :baz
     {:error, _} -> :bing 
   end

versus

    private_fun(:foo)
    ....
    defp private_fun({:ok, :bar}), do: :baz
    defp private_fun({:error, _}), do: :bing

I am just wondering if one is more performant than the other. And also, which style is preferred.